SERMA
WORKREST BLADES
FOR CENTERLESS GRINDERS
BASIC FACTS
THE CHANNELLING FLUX
Modern high-tech materials integration into the metalworking industry poses considerable challenges. PCD and CFRP requires indeed significant expertise in designing
fiber orientation, in weld joining interfaces, in precisely trimming to micrometric
proportions the hardest substance known on earth. Both new supermaterials impressive potential have been exploited to bring to their extremes the quest for enhanced
wear resistance, provided by PCD diamond, and superior damping ability, given by
the CFRP body.
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Centerless grinding is a metalworking process suitable to machine perfectly round
parts efficiently and effectively. Such distinctive features are due to the set up where
the workpiece is supported along three lines of contact: the grinding wheel, the control
wheel and the workrest blade. The workrest restrains the workpiece during the
process and must absorb a substantial part of the interacting forces. Especially for
long run and large volume productions as well as in case of tight tolerance requirements, the workrest blade plays an essential role: it is a critical element whose function is a major concern among specialists.
1
on
FAST FACTS
THE PERFECT BLADE
PCD
is the acronym of
Poly Crystalline Diamond,
and consists of diamond
particles, dispersed into
a binder, grown upon a
substrate.
CFRP
stands for Carbon Fiber
Reinforced Plastic,
and is a fiber compound
made of plastic matrix
(polymer) and carbon
fiber layers.
2
TRUE FACTS
VALUE ADDED
Vibrations
influencing the blade behavior,
which then could undermine the
consistency of the grinding operation, vibrations are caused by several factors: e.g. workpieces with
areas of different hardness, out of
round of one or more diameters,
uneven stock to be removed.
Stiffness
Damping factor
Thermal stability
Wear
usually develops as a
straight line, is due to the
motion of the workpiece
and its relative movement
climbing up the towards
blade tip as the stock is
ground away. It affects
the quality of the work.
Hardness
Heat sensitivity
Friction coefficient
3
REAL FACTS
SCIENCE BEHIND THE TECHNIQUE
designing
stage
0,5 μm
1,0 μm
10,0 μm
25,0 μm
0,5 mm
1,0 mm
2,0 mm
3,0 mm
grade
pcd
thickness
non-polished
polished
adhesive engineering
fabric
93
99
103
110
118
130
67
73
core
41
47
0
cfrp
15
21
3k
6k
small cell
12 k
24 k
aluminium medium cell
honeycomb nomex
large cell
foam
wood
solid
6
2,045±0,05
20°
A
17
M6x1 - 6H
5
R5
86,5
14
107
128,5
45°
R5
5
0,8
80
80
B
80
10±0,2
0,571±0,002
0,684±0,002
4,5
0,005/100
0,010
0,629±0,002
330
A
4
A
HARD FACTS
APPLICATION EXAMPLES
SPINDLE SHAFT
SPIDER
CRANK
ENGINE VALVE
5
HARD FACTS
APPLICATION EXAMPLES
DIESEL INJECTION NEEDLE
INTEGRATED BEARING
TOOL SHANK
HYDRAULIC SPOOL
6
SERMA
WORKREST BLADES
FOR CENTERLESS GRINDERS
I
L
ELLECTUA
T
N
PATENTED
SERMA S.r.l.
Via Due Portoni, 41 - 40132 Bologna (IT)
Tel. +39-(0)51-6415006 - Fax. +39-(0)51-6415008
e-mail: [email protected] - web: www.sermasrl.it
OPERTY
LRCFK - EN1410-0
PR